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/* $OpenBSD: mlinks.c,v 1.3 2016/11/05 16:43:50 schwarze Exp $ */
/*
* Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Some operating systems need MLINKS for pages with more than one name.
* Extract these in a format suitable for portable LibreSSL.
*/
#include <err.h>
#include <regex.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "dbm_map.h"
#include "dbm.h"
int
main(int argc, char *argv[])
{
const int32_t *pp; /* Page record in the pages table. */
const char *np; /* Names of the page. */
const char *fp; /* Primary filename of the page. */
const char *ep; /* Filname extension including the dot. */
size_t flen, nlen;
int32_t i, npages;
if (argc != 2)
errx(1, "usage: mlinks filename");
if (dbm_open(argv[1]) == -1)
err(1, "%s", argv[1]);
pp = dbm_getint(4);
npages = be32toh(*pp++);
if (npages <= 0)
errx(1, "database empty or corrupt: %d pages", npages);
for (i = 0; i < npages; i++, pp += 5) {
np = dbm_get(pp[0]);
if (np == NULL)
errx(1, "database corrupt: bad name pointer");
/* Skip files with just one name. */
if (strchr(np, '\0')[1] == '\0')
continue;
fp = dbm_get(pp[4]);
if (fp == NULL)
errx(1, "database corrupt: bad file pointer");
/* Skip the file type byte. */
fp++;
/* Skip directory parts of filenames. */
ep = strrchr(fp, '/');
if (ep != NULL)
fp = ep + 1;
ep = strrchr(fp, '.');
if (ep == NULL)
errx(1, "no filename extension: %s", fp);
flen = ep - fp;
while (*np != '\0') {
/* Skip the name type byte. */
np++;
/* Skip the primary filename. */
nlen = strlen(np);
if (nlen == flen && strncmp(fp, np, nlen) == 0) {
np = strchr(np, '\0') + 1;
continue;
}
/* Describe the desired mlink. */
printf("%s,", fp);
while (*np != '\0')
putchar(*np++);
np++;
puts(ep);
}
}
dbm_close();
return 0;
}
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